A straightforward method for synthesizing the pyrazole N-oxides from N-propargylamines and AgNO through oxidation/cyclization reaction had been developed. AgNO was used as the NO source for the first time to synthesize pyrazole N-oxides. Various substituted groups on N-propargylamines proceeded smoothly, and the desired products were obtained in good yields.
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| http://dx.doi.org/10.1021/acs.orglett.6b03021 | DOI Listing |
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